Adak A, Balasaria S, Mukhopadhyay B. Concise synthesis of the tetrasaccharide repeating unit of the O-antigen from Escherichia coli O131 containing N-acetyl neuraminic acid.
Carbohydr Res 2022;
521:108654. [PMID:
36084574 DOI:
10.1016/j.carres.2022.108654]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Revised: 08/20/2022] [Accepted: 08/22/2022] [Indexed: 11/02/2022]
Abstract
Synthesis of the tetrasaccharide repeating unit of the O-antigen from E. coli O131 was accomplished through a linear strategy involving rationally protected monosaccharide units derived from commercially available sugars. The challenging α-glycosylation of N-acetyl neuraminic acid was achieved through activation of thioglycoside using NIS-mediated glycosylation strategy. The target tetrasaccharide in the form of its 3-aminopropyl glycoside may be used for further glycoconjugate formation without hampering the anomeric stereochemistry.
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